Search for diphoton events with large missing transverse energy in pp̅ collisions at = 1.8TeV

Abstract

A search for new physics has been carried out in the channel pp̅→ γ γ +E_T, as expected in various supersymmetric models. We require two photons with transverse energy E_T^γ> 12GeV and pseudorapidity |η^γ|<1.1. The distribution of missing transverse energy ( ET) is consistent with background and no events have E_T > 25GeV. We set limits on production cross sections for selectron, sneutrino, and neutralino pairs, decaying into photons, which range from about 400 fb to 1 pb depending on the sparticle masses. A general limit of 185 fb (95% C.L.) is set on σ(pp̅→γγE_T+X), where E_Tγ >12GeV, |η^γ| < 1.1, and E_T> 25GeV.